Is there a GitHub MCP tool (or API) that can open an interactive chat session with Copilot for codebase exploration — e.g., investigating features or debugging — without creating a PR?

Currently, the only programmatic option I'm aware of is assign_copilot_to_issue_with_intent, which assigns the coding agent to an issue. However, that workflow is:

• Asynchronous (no back-and-forth conversation)

• PR-centric (always creates a branch + PR)

What I'm looking for is a way to programmatically start a synchronous, conversational session with Copilot that has full codebase context — similar to Copilot Chat on github.com — but invokable via MCP/API.

Questions:

1. Does such a tool/API exist today?

2. If not, is this on the roadmap?

3. Are there alternative approaches to achieve interactive, read-only code Q&A programmatically?

Thanks!